SearchResultIterator.php

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<?php
namespace Magento\Ui\Model\Export;

class SearchResultIterator implements \Iterator
{
    protected $items;

    public function __construct(
        array $items
    ) {
        $this->items = $items;
    }

    public function current()
    {
        return current($this->items);
    }

    public function key()
    {
        return key($this->items);
    }

    public function next()
    {
        next($this->items);
    }

    public function rewind()
    {
        reset($this->items);
    }

    public function valid()
    {
        return $this->key() !== null;
    }
}